#!/bin/sh
# Convert existing render-test exports without trimming, resampling or labels
# inside the framebuffer. ImageMagick is optional, not a make check dependency.
set -eu
if [ "$#" -ne 1 ]; then
    echo "Usage: sh tests/render-images.sh ABSOLUTE_OUTPUT_DIRECTORY" >&2
    exit 2
fi
cd "$1"
for pgm in ./*-[01].pgm; do
    [ -f "$pgm" ] || continue
    base=${pgm%.pgm}
    [ "$(wc -c < "$base.bin")" -eq 860 ]
    { printf 'P4\n160 43\n'; cat "$base.bin"; } > "$base.pbm"
    # Compare the packed 1-bit buffer independently with the PGM export.
    compare -metric AE "$base.pbm" "$pgm" null: 2> "$base-pixels.log"
    convert "$pgm" +repage -type TrueColor "PNG24:$base-native.png"
    convert "$base-native.png" -sample 800% +repage "PNG24:$base-8x.png"
    convert "$base-8x.png" -sample 160x43! +repage "PNG24:$base-roundtrip.png"
    compare -metric AE "$pgm" "$base-native.png" null: 2>> "$base-pixels.log"
    compare -metric AE "$pgm" "$base-roundtrip.png" null: 2>> "$base-pixels.log"
    rm "$base-roundtrip.png"
    # Smaller contact tiles avoid shrinking wide sheets in image viewers.
    # Keep the eightfold originals available for individual pixel inspection.
    convert "$base-native.png" -sample 400% +repage "PNG24:$base-4x.png"
done
for group in off nvidia amd single dual large unknown odd maximum; do
    [ -f "$group-0-4x.png" ] || continue
    montage -font DejaVu-Sans -pointsize 14 -background '#dddddd' \
        -label "$group: five-row summary (4x)" "$group-0-4x.png" \
        -label "$group: four-row summary (4x)" "$group-1-4x.png" \
        -tile 1x2 -geometry +8+8 "PNG24:contact-$group.png"
    height=$(identify -format '%h' "contact-$group.png")
    for variant in 0 1; do
        top=$((8 + variant * height / 2))
        convert "contact-$group.png" -crop "640x172+8+$top" +repage \
            "PNG24:$group-tile-check.png"
        compare -metric AE "$group-$variant-4x.png" "$group-tile-check.png" \
            null: 2>> "$group-contact-pixels.log"
    done
    rm "$group-tile-check.png"
done
if [ -f contact-off.png ] && [ -f contact-nvidia.png ] && [ -f contact-amd.png ]; then
    convert contact-off.png contact-nvidia.png contact-amd.png -append +repage \
        PNG24:contact-legacy.png
fi
if [ -f contact-dual.png ] && [ -f contact-large.png ] && [ -f contact-unknown.png ]; then
    convert contact-dual.png contact-large.png contact-unknown.png -append +repage \
        PNG24:contact-metrics.png
fi
if [ -f contact-odd.png ] && [ -f contact-maximum.png ]; then
    convert contact-odd.png contact-maximum.png -append +repage PNG24:contact-paging.png
fi